The 'ports' node is not supposed to have a 'reg' property at all, in
fact, doing so will lead to dtc issuing warnings looking like these:

arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts:109.4-14: Warning (reg_format): /switch/ports:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dtb: Warning (pci_device_reg): Failed prerequisite 'reg_format'
arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dtb: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dtb: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dtb: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts:106.9-149.5: Warning (avoid_default_addr_size): /switch/ports: Relying on default #address-cells value
arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts:106.9-149.5: Warning (avoid_default_addr_size): /switch/ports: Relying on default #size-cells value

Fix the example by remove the stray 'reg' property.

Reported-by: Stephen Rothwell <redacted>
Fixes: 3b3b6b460f78 ("net: dsa: Add bindings for Realtek SMI DSAs")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 Documentation/devicetree/bindings/net/dsa/realtek-smi.txt | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/dsa/realtek-smi.txt b/Documentation/devicetree/bindings/net/dsa/realtek-smi.txt
index 7959ec237983..a8d0f1febe32 100644
--- a/Documentation/devicetree/bindings/net/dsa/realtek-smi.txt
+++ b/Documentation/devicetree/bindings/net/dsa/realtek-smi.txt

@@ -84,7 +84,6 @@ switch {
 	ports {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		reg = <0>;
 		port@0 {
 			reg = <0>;
 			label = "lan0";

@@ -174,7 +173,7 @@ switch {
 	ports {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		reg = <0>;
+
 		port@0 {
 			reg = <0>;
 			label = "swp0";

-- 
2.25.1